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Unlock every car and track:
Press and hold R1 + L1 and push Circle, Square(2),
Triangle, X in the main menu. You will hear the sound of an engine if you have entered the code correctly
Every car:
By collecting 11 Bonus Stunt items while completing Challenge 8.
Every world:
Find the Hidden Key while completing Challenge 18. The yellow key
is in the Mines, across a trestle at the end of a tunnel.
Every gadgets:
By hitting 25 Barrels while completing Challenge 7.
Laser upgrade:
Finish every challenge, then unlock the "Timer Speed" cheat. Set it
to 10% speed. After altering the difficulty level to very hard then finish Challenge
18. Get the "A+" rank to unlock the "Laser Upgrade" cheat.
Unlimited ammunition:
By hitting 50 Barrels while completing Challenge 18.
Unlimited health:
By hitting 179 Barrels while completing Challenge 17.
Unlimited turbo:
By collecting 8 Zappers while completing Challenge 4.
Timer speed:
By hitting 13 Detour Signs while completing Challenge 15.
Gadgets for completing challenges:
Challenge 1: Laser Cannon
Challenge 3: Sonic Boom
Challenge 4: Atom Blaster
Challenge 7: Freon Bomb
Challenge 9: Energy Shield
Challenge 10: Jet Booster
Challenge 13: Super Zapper
Challenge 15: Magnet Mine
Challenge 16: Doom Disks
Underworld Arena:
Finish Challenge 17.
Sho-Stopper vehicle:
Finish Challenge 6.
Surf Crate vehicle:
Finish Challenge 12.
Krazy 8s vehicle:
Finish Challenge 18.
HW Prototype vehicle:
Finish every mission in adventure mode.
Underworld Track:
Finish Challenge 2.
Glacier Track:
Finish Challenge 11.
Sewer Pipe Arena:
Finish Challenge 5.
Crankshaft Docks:
Finish Challenge 8.
Treadwell Plaza:
Finish Challenge 14.
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